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Henry,
the exercise should have then named the index error negatively: if it adds
2'.0 to the sextant altitude then the index correction is +2'.0: the error
thus must be -2'.0 which is off the arc: if it's on take it off, if it's off
take it on.
Federico

-----Messaggio originale-----
Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto di
hch
Inviato: venerd� 15 agosto 2008 5.29
A: NavList@fer3.com
Oggetto: [NavList 6134] Re: Ocean Yachtmaster Exercises


Frederico,

If I understand your posting, the exercise is correct in naming an off the
arc error positively as an off the arc error is applied additively (+), and
an on the arc error, negatively (-). Just remember ... " if it's on, it's
off (-), if it's off, it's on (+)"

Happy correcting.

Henry


--- On Thu, 8/14/08, Federico Rossi  wrote:

> From: Federico Rossi 
> Subject: [NavList 6132] Ocean Yachtmaster  Exercises
> To: NavList@fer3.com
> Date: Thursday, August 14, 2008, 5:17 PM
> Hi,
> 
> today I was working an ocean passage making exercise taken
> from this book
> (Ocean Yachtmaster Exercises published by Adlard Coles
> Nautical - London)
> and I was quite surprised by what seems a trivial error to
> me, i.e. the
> exercise states that index error is +2'.0. Isnt'it
> on the arc? So the index
> correction should be -2'.0. but the solution shows a
> +2'.0 correction, and
> the same happens for the following exercises. How is it
> possible?
> 
> Federico
> 
> 
> 

      



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